The task was to find an answer to the thriving interest in carolingian culture and history and thereby reactivate the katschhof as a connecting square. a carolingian museum would be perfectly located here. the katschhof, this very place of carolingian history forms an adequate entrance situation for a carolingian display cabinet. the strict orientation of the katschhof is the first clue. south of the square cathedral and convent hook up, in the north city hall and the projected museum could be concepted as >earthly< counterparts. the alignment of the museum follows the orthogonal layout of the carolingian city grid. the museum appears to be a glazen cabinet facing katschhof, the roof appearing like a piece of city surface: a lifted cobble-stone blanket revealing the carolingian secrets underneath. the museum itself is concepted like a winding trail between cabinet boxes, the academy and service functions forming the museum's backbone. the backbone also defines the border between museum and city block with a typical mixture of housing and commerce: a transversal path connecting market square and fischmarkt. the museum's roof terrace forming an additional public square. arranged with a layout of herbal and flower beds the handed-over biological, medical and culinary wisdom of the carolingian era is shown in a park-like surrounding. a raised stone garden with a view over aachen's medieval center.